Hossain, Muhammad IqbalChowdhury, TahmidJahan, Tabassum NusratRifat, Golam RabbaniNahid, Sadman Sakib2024-04-242024-04-2420232023-09ID 19201115ID 19201027ID 19201041ID 19201029http://hdl.handle.net/10361/22666Cataloged from PDF version of thesis.Includes bibliographical references (pages 61-63)This thesis is submitted in partial fulfillment of the requirements for the degree of Bachelor of Science in Computer Science and Engineering, 2023."Nowadays in the current situation security in preserving data, keeping credentials is essential. Everytime a patient goes to a different healthcare institute that patient needs to go through checkup, most of the times same medical tests repetitively. Because of this inefficiency, the cost in the healthcare sector keeps increasing thus proper health care is not ensured for general people.Though in many healthcare institute a centralized data server(EHS) is used which is a problem because of single point of failure. In a centralized data storing system hacker can deploy cyber attack that’s why a decentralized data storing system is needed. Though a decentralized data storing system is expensive comparing to centralized system it can provide security, privacy,transparency and interoperability. For deploying decentralized system blockchain can ensure privacy as well as data integrity because if any data is added to the block chain it would be immutable(can’t be changed). In our proposed model medical records are encrypted and stored outside a blockchain and location of the records and other transaction information are stored in the blockchain where repetitive cost will be reduced and accountability among healthcare providers will be established.This thesis paper propose a blockchain based healthcare system where access of patient data is controlled effectively"63 pagesenBrac University theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission.BlockchainMedical blockchainSecure decetralized modelBlockchains (Databases)Thesis